The transistor was first demonstrated at Bell Labs
On this day · 23 December 1947
Two physicists showed colleagues a thumb-sized germanium device that amplified sound — and quietly started the digital age.
On 16 December 1947, John Bardeen and Walter Brattain at Bell Telephone Laboratories in Murray Hill, New Jersey, coaxed a sliver of germanium with two gold contacts into amplifying an electrical signal. The point-contact transistor could boost a signal up to a hundredfold.
A week later, on 23 December 1947, they demonstrated it to Bell Labs’ leadership, switching the device in and out of a circuit so officials could hear speech grow louder. Their boss William Shockley later called it “a magnificent Christmas present.”
No glowing filament, no fragile glass — just solid material doing the work of a vacuum tube.
The transistor was smaller, cooler and more reliable than the tubes it replaced. Bardeen, Brattain and Shockley shared the 1956 Nobel Prize in Physics, and their invention became the building block of every computer, phone and chip that followed.
Sources & references
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